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Need help choosing an RPV and install question (Chicago)

I live in the City of Chicago. I recently purchased a house that has an irrigation system that works quite well but it does not have an RPZ. From a health perspective this concerns me.

There is 1" line coming out of the foundation from the basement, it goes up about 12" to a 90deg and makes a hoop about 12" horizontal then back into the ground.

Here is an illustration
|---RPV?----|
| |
| |______Basement

My question is 3 fold:
1. What is a good recommendation for a RPV valve to buy. Im looking for longevity

2. Im reading its possible to remove these in the winter. Can someone please link to me the material that one would need to couple these so that it could be removed for winter. I've soldered enough in my life to attempt this myself. Im just not sure on the material I would need to couple it. I see the RPV have female threads

3. I assume from my diagram I simply need to cut the copper at the hoop and install the RPV there - is it that cut and dry?

Check with the City of Chicago's Public Works Dept. as to the recquired form of Backflow Prevention. Generally, a PVB is recquired if it can be placed 18" above the highest pipe/head of the system. An RPZ is generally used if it can't be the highest point of the system. Again, check your water dept. for proper codes.
PVB: Wilkins 720A, Febco 765-1
RPZ: Febco 825, Wilkins 375

Always deferring to local codes, RPZs usually come into play when something like fertilizer is injected into the irrigation system, increasing contamination hazard, or for elevation problems, as Central noted.
PVBs tend to fit your illustration best as far as installation.

The one's I read about being removable are on PVC or galvanized and union couplings.
However I'm in south east Texas and barely know what 'freeze' means.I really don't know what it would be like to remove a backflow during the winter.

If you are going to install an RPZ with unions, do not use the Febco 825Y model, as shown. It is better suited for permanent installation, and the winterizing maintenance performed in place each fall, according to mfr instructions.

If you are going to install an RPZ with unions, do not use the Febco 825Y model, as shown. It is better suited for permanent installation, and the winterizing maintenance performed in place each fall, according to mfr instructions.